I have made the DD-27 pistol. It uses the same barrel as the actual DD-27, but it is more compact. Dsman195276 has allowed me to use his barrel design. This barrel is totally his design, I did not design any part of the barrel.

Link to the DD-27: https://www.instructables.com/id/DD-27-V2.75-compact-AST-rifle/

Step 1: Barrel

Here is the barrel for the DD-27 pistol. Once agasin this is not my design it is dsman195276's design.

1:Make
2:Make
3:Connect
4:Make
5:Connect
6:Make
7:Connect
8:Make
9:Connect
10:Make
11:Connect
12:Make
13:Connect and done.

Step 2: Firing System

This is my design.

1-3:Make
4:Make
5:Add
6:Make
7:Add
8:Add
9:Make
10:Make
11:Make
12:Connect
13:Firing Pin

Step 3: Handle

This is also mine.
1:Make
2:Make
3:Connect
4:Add blue rod
5:Make
6:top view
7:Connect
8:Make
9:Add

Step 4: Connecting

Here we go.
1:Barrel and Body
2:Connect
3:Handle and body.
4:Connect
5:Take off the top gear and put in the firing pin then put it back on.
6:Trigger and Body
7:Connect
8:Rubber bands
9:DONE!!!!!!!!!!